At FabLabRUC we have been experimenting with differnt kinds of metal casting. One of the methods is "lost PLA casting" where a 3D printed PLA model is covered with plaster and made to melt away when molten metal is poured over it.

Problem is that the metal (aluminium in this case) cools off too quickly when it contacts the plastic.

I wanted to find a method to keep the metal molten while inside the mold.